Elevator-brake.



No. 823,720. PJQLTITIEJ) JUNE 19, 1906.

MOGLELLAN FULLENLOVE.

ELBVATOR BRAKE.

APPLIOATION FILED JAN-.13. 1905.

' iii-Nimh s'rArns ATENT OFFICE.

MCCLELLAN FULLENLOVE, OF LOUISVILLE, KENTUCKY, ASSIGNOR TO FULLENLOVE ELEVATOR COMPANY, OFA- LOUISVILLE, KENTUCKY, A

y CORPORATION OF KENTUCKY.

yELEvAToR-BRAKE.

a vSpecification qf Letters Patent.

Application led January 13', 1905i Serial No. 240,943.

Patented June 19, 1906. i

- at 2904 West Kentucky street, Louisville,

Kentucky, have invented certain new and useful Improvements in Elevator-Brakes, of

. which the following is a specification.

This invention relates to elevator-brakes;

-and it has for an object to provide an imyprovement in that type of brakes which employs a traveling spiral working on a fixed rack or spiral.

A further object is to provide a brake which operates whenever the vspeedof the cage becomes excessive in either direction.

i Other objects and. advantages will appear in the following description and will be more l particularly pointed out in the claims.

, In the drawings, Figure 1 is a view showing one embodiment of mybrake, partiallyin 4vertical'section and connected to an elevatorcage. Fig. 2 is a like view of another embodiment. Fig. 3 is a like view of still another embodiment, and Fig. 4 is another embodiment of the braking-surfaces.

Referring more particularly to the drawings, 1 indicates the ca e, 2 the hoisting-cable, and 3 the elevator-wel Mounted to one side of the well is a tube 4, provided with an internal rack or spiral 5, on which travels a spiral 6, provided with external threads 7. This spiral is mounted in a U- shaped frame 8, working through a slot 9 in the tube 4 and is capable of va longitudinal axial movement in its bearings 10 and 11. The upper end of the spiral is provided with a conical or tapering braking-surface 12, that engages with a like braking-surface 13 on the Ulshaped frame when vthe spiral moves axia y.

connecte withy the bottom of the elevatorcage by a cable 14, that passes over a pulley 15 at the upper end ofthe tube 4 and around pulleys 16 at the lower end of the elevatorwell 3 while the lower part of the U-shaped frame is connected to thev top of the cage by a cable 17 which passes around'a pulley 18 at the lower end of the tube 4 and over pulleys 19 at the upper end of the well. bodiment if the hoisting-rope 2 should break, the cage in dropping would cause the U- shaped frame 8, through the medium of cable The upper part of the U-shaped frame 8 is` l thereby move the spiral axially into engagement with conical braking-surface 15 and hold the cage against a further fall. This same action will take place when the cage descends too rapidly, even if the cable does not break.

In the embodiment shown in Fig. 2 the cage 1 is mounted in a well 3, as in Fig. 1, the slotted tube 4 being likewise provided and 17, to descend quicker than the spiral 6,*and

the U-shaped frame 8, carrying the spiral 6,

being of the same construction; but the U- shaped frame isconnected at its upper end to the upper end of the cage 1 by a cable 2() instead of to the lower end of said cage. This cable 20 passes over a pulley 21 at the upper end of the tube and pulleys 22 at the upper end of the well. In this embodiment the U- shaped frame and the spiral 6 are provided at f face 12a on the spiral being held off the raking-surface l3a'by means of a spring 25, whlch bears against the lower end ofthe spiral. This construction operates under the same conditions as those set.forth relative t0 Fig. 1.

In the embodiment shown in Fig. 3 there is provided a tube 4a, having. a smooth interior and a slot 9a. The fixed rack or spiral 5EL is in this embodiment in the form of a pair of intertwined cables, and the traveling spiral 6a has a central spiral opening through which the spiral 5a works. The traveling spiral 6 is carried by a U-shaped frame 8, like that shown in Figs. 1 and 2 and carries brakingsurfaces 12 and 12S, respectively, at its upper and lower ends,`which surfaces are adapted for contact with surfaces13 and 13a on the upper and lower portions of the U-shaped frame 8, the surface 12a being held away from the surface 13 by means of spring 25. The frame8 is connected with the top and the bottom of the cage l by cables 17 and 14, respectively, in the same manner as in Fig. 1.

yThis embodiment operates under the condi- 'into action to retard its movement. In this em- In all embodiments the braking-surfaces maybe either of the shape of a cone of revolution, as shown in Figs. 1 to`3, or of a polygonal tapering shape, as shown at 1,2X and IOO 13 in Fig. 4, or of any other form. The conical surfaces shown in Figs. l to 3, however, have a tendency to bind and for this reason those shown in Fig. l are at present preferred.

vThe embodiments herein shown are for the purpose of illustration only, and I therefore desire it to be understood that within the scope of the appended claims I may make various changes without departing Jfrom the spirit or sacrificing any of the advantages of my invention.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-- 1. In an elevator-brake, the combination with the cage, of a iixed rack, a spiral traveling on the rack, and cable connections between the spiral and the cage.

2. In an elevator-brake, the combination with a cage, of a fixed rack, a spiral traveling on the rack, a frame in which the spiral is axially movable, and cable connections between the frame and the rack.

3. In an elevator-brake, the combination with the cage, of a brake traveling with the cage, and cable connections between the cage and the brake to cause them to move together. y 4. In an elevator-brake, the combination with the cage of a traveling spiral, means for braking the spiral, and a cable connection between the cage and the spiral.

5. In an elevator-brake, the combination with a Cage, of a spiral traveling. with. the cage and movable axially downwardly to cause a braking action, and a spring normally preventing the braking action.

6. In an elevator-brake, the combination with the cage, of a spiral traveling with the cage and movable axially downwardly to 9. In an elevator-brake, the combination with the cage of a ixed slotted tube mounted to one side of the cage, a rack mounted within the tube, a spiral for travel on the rack, a frame carrying the spiral and extending through the slot in the tube, means for braking the traveling spiral and a cable connection between the cage and the frame.

The foregoing specification signed at Louisville, Kentucky, this 26th day of November, 1904.

MCCLELLAN FULLENLOVE.

In presence of- F. H. KAPPA, STELLA C. Nonnrs. 

